I also had this happen. Literally almost the exact same, don't remember whether I opened my eyes or not but I remember hearing crunching sounds coming from my m

I also had this happen. Literally almost the exact same, don't remember whether I opened my eyes or not but I remember hearing crunching sounds coming from my mouth and realizing it was them drilling or hammering or doing something destructive to my wisdom teeth. But zero pain. Just a wtf that is weird af feeling. But then I passed back out (not sure if they did something to make me fall back asleep or if it occurred of its own accord).